My broken-in 600 Ohm 880's are my "go to" dynamic phone, the one HP I would rescue in a fire (right after my Spritzer-mod 007's are safe in my hands).
My extended family here has Pro 750's, D2000s, 701s, HD600s, AT2Ks, and GS-1000's ... have listened to them all, a lot, and each has a strength for sure, and for some genres beat the 880/600's. But "all around" for a (semi)open phone the 880/600's take the gold.
But is it all about to change? We just sent everything out to be modded and balanced. Darth/Larry/Headphile did the 880's, and he emailed me that they sound fantastic ... currently enroute. Markl/Lawton Audio says he has transformed the D2000's into "something else" and they now play on a new level ... can't wait for the smackdown.
All the others have had work done too. Stefan/Equinox/Grado Labs did the GS1000s, Drew/moon-audio did the 750's, Headroom the 701s, and APS is working on the AD2K's. Got Zu balanced for the Senns HD600.
When I get a balanced source and amp all sorted the battles will begin anew. Then the dynamic winner takes on the Stax (assuming it wins the stat contest -- we are [trying to] carefully restore a vintage HE60 that we liberated from a home that apparently houses heavy smokers, plastic-chewing tigers, and alien leather eaters).